Summary
Mini-dose heparin has demonstrated a significant decrease in postoperative deep venous
thrombosis as manifested by 125I fibrinogen venous limb scans. Whether a similar benefit in lethal pulmonary emboli
can be demonstrated is currently under active investigation in England and the Continent.
If this European multicenter trial yields a positive result, a safe method for the
primary prevention of postoperative pulmonary emboli will have been established. Such
a result would encourage evaluation of mini-dose heparin for the prophylaxis of venous
thromboembolism among patients with acute myocardial infarction and perhaps for arterial
thrombosis complicating coronary arterial bypass surgery.
The late Carl V. Moore, when told of the original Kakkar trial and the rationale behind
it, said “well, if it doesn’t work, it ought to!” That may be the way many sympathetic
investigators, myself included, feel about mini-dose heparin, but in the end everyone
knows that the decisions will be based on hard data.